HVAC Fan Power Transistor Replacement Question | FerrariChat
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HVAC Fan Power Transistor Replacement Question

Discussion in 'Technical Q&A' started by afterburner, Mar 20, 2018.

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  1. afterburner

    afterburner F1 Rookie
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    #1 afterburner, Mar 20, 2018
  2. mello

    mello F1 Veteran
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    #2 mello, Mar 20, 2018
    What's the original? What's the spec of the fan?
     
  3. Motob

    Motob Formula 3
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    #3 Motob, Mar 20, 2018
    Umm, It might be a good idea to post what model/year car the application is for. Most likely it is the same transistor that is used in the Testarossa. Do a search on Testarossa blower speed transistor and see what people have used for a replacement. Look at the number on the transistor that you are replacing to see if it is the same as a TR.
     
  4. afterburner

    afterburner F1 Rookie
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    #4 afterburner, Mar 21, 2018
    Steve, Brian, thanks, it is for my '83 Mondial QV, and it is the same unit as used in the TR.

    The fan motor is a Bosch 12V unit as used in many BMWs:

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    I could't get the original power transistor here, but to my knowledge it is similar to an NPN type 2N3055 / 10A collector current:

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    I don't know enough about the subject to evaluate if what I bought is a valid replacement component.
    Thanks for your advice.
     
  5. ferrariformulauno

    ferrariformulauno Formula 3

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    #5 ferrariformulauno, Mar 21, 2018
    2N5301 made by STM Electronics was original Blower Motor Transistor for the E23, E24,E28 BMW with that Fan Motor, it is important to have one with a minimum Ic (collector current rating) of at least 15A.

    If you can get the 2N5301 which has an Ic of 30A, I would go with this:

    Type Designator: 2N5301

    Material of Transistor: Si

    Polarity: NPN

    Maximum Collector Power Dissipation (Pc): 200 W

    Maximum Collector-Base Voltage |Vcb|: 40 V

    Maximum Collector-Emitter Voltage |Vce|: 40 V

    Maximum Emitter-Base Voltage |Veb|: 5 V

    Maximum Collector Current |Ic max|: 30 A

    Max. Operating Junction Temperature (Tj): 200 °C

    Transition Frequency (ft): 2 MHz

    Forward Current Transfer Ratio (hFE), MIN: 15

    Noise Figure, dB: -

    Package: TO3
     
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  6. afterburner

    afterburner F1 Rookie
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    #6 afterburner, Mar 21, 2018
    Ciao Andre - great information, thank you! What I have at hand is close.
    Could you please check the values behind yours and tell me whether it's ok to use it.
    My electronics knowledge isn't profound enough to evaluate it. If not I'll try to find a 2N5301.

    Type..........2N5301-------BUX10
    Material.....Si---------------Si
    Polarity......NPN-----------NPN
    Max Pc.....200 W--------150 W
    Max Vcb....40 V-----------160 V
    Max Vce....40 V-----------125 V
    Max Veb....5 V-------------7 V
    Ic max.......30 A------------25 A
    Max. Tj......200 °C--------200 °C
    ft................2 MHz--------8MHz
    hFE MIN...15--------------10
    Package....TO3------------TO3

    Many thanks and best regards from HK
    Urs
     
  7. ferrariformulauno

    ferrariformulauno Formula 3

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    #7 ferrariformulauno, Mar 22, 2018
    Urs that will work, good luck let us know how it goes.

    Andre
     
  8. afterburner

    afterburner F1 Rookie
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    #8 afterburner, Mar 22, 2018
    Thank you much, Andre!
     
  9. eric355

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    #9 eric355, Mar 27, 2018
  10. afterburner

    afterburner F1 Rookie
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    #10 afterburner, Mar 27, 2018
    Merci Monsieur!
     
  11. eric355

    eric355 Formula 3
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    #11 eric355, Mar 27, 2018
    De rien ... :)

    You can sort the list by power, Ic, ...
    Quite useful.
     
  12. afterburner

    afterburner F1 Rookie
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    #12 afterburner, Mar 27, 2018
    En effet, très utile ;-)
     

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